Os vs atomic number 76

Os and atomic number 76 both are nouns.

Word	Noun	Adjective	Verb	Adverb
Os	Yes	No	No	No
atomic number 76	Yes	No	No	No

As nouns, Os and atomic number 76 are synonyms defined as:

Os and atomic number 76: a hard brittle blue-grey or blue-black metallic element that is one of the platinum metals; the heaviest metal known

Other synonyms of Os include osmium.

Os (noun)	atomic number 76 (noun)
a hard brittle blue-grey or blue-black metallic element that is one of the platinum metals; the heaviest metal known	a hard brittle blue-grey or blue-black metallic element that is one of the platinum metals; the heaviest metal known